Finder pattern for optically encoded machine readable symbols
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United States of America Patent
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-
Feb 23, 1993
Grant Date -
N/A
app pub date -
Oct 30, 1990
filing date -
Oct 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optically encoded information bearing label containing a two dimensional array of data cells includes a finder pattern comprising a plurality of spots arranged in a predetermined geometric pattern substantially analogous to the predetermined geometric pattern of said two dimensional array of data cells. The finder pattern is detected by first scanning the image area to detect spots. The locations of detected spots are compared to the known geometry of the finder pattern in order to provide for rapid and reliable finding of the finder pattern and the information bearing label. Additionally, the detected finder pattern spots provide information for decoding the two dimensional data array in order to compensate for label magnification, tilt and other distortions.
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